Crane for heavy lifting with an erection column for the main jib

Details Crane for heavy lifting with an erection column for the main jib Crane for heavy lifting with an erection column for the main jib

1980-07-03

1982-10-19

Sheridan, Robert G.

Traversing hoists

Having means facilitating assembly or disassembly

B66C 2300

Patent

active

043546072

ABSTRACT:
A crane of the type having a slewing upper chassis 5 carrying a jib, the lowermost component of which is shown at 10, and an erection column 12 for raising the jib from a horizontal assembly position into an upright operating position, has a hydraulic cylinder 11 connected to the component 10 and a cable 13 connecting the component 10 to the column 12. The column 12 is raised from the lowered position shown to an upright position, in which subsequently a tackle 14 swings the column 12 rearwards and raises the jib to its upright operating position, by means of the cylinder 11. A better purchase can be obtained by the cylinder 11 acting on the component 10 than by a cylinder acting directly on the column 12 which is usual, and therefore a smaller cylinder can be used.

REFERENCES:
patent: 3082746 (1963-03-01), Kerridge

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